[Bug 81841] amd-iommu: kernel BUG & lockup after shutting down KVM guest using PCI passthrough/PCIe bridge

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https://bugzilla.kernel.org/show_bug.cgi?id=81841

--- Comment #8 from Marti Raudsepp <marti@juffo.org> ---
(In reply to Alex Williamson from comment #7)
> > There are some proposed workarounds on the web
> None of these remotely address the issue.

I see. This page claims so: http://www.ovirt.org/Features/hostdev_passthrough

> there are quirks for the following AMD southbridge components

Nope, mine are 1022:780b, 1022:780c, 1022:780d, 1022:780e, 1022:780f, 1022:7809

> If your bridge does not match these, then AMD will need to confirm whether
> isolation is provided between your devices.

How would I go about confirming that? What are the chances that they care, and
provide accurate information to a random person?

> There is an ACS override patch

I already ran across it... https://bugzilla.redhat.com/show_bug.cgi?id=1113399
Would I be any worse off using this, compared to the old kvm pci-assign method?

> Note that it's not required to assign all the devices, they simply need to
> be detached from host drivers (ie. bound to pci-stub or vfio-pci).

Thanks, I will give it a shot tomorrow.

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